Helix is bigger in the right places (much larger exposed ambient face, 13 charge rows with rounded ambient and charge row bars), bolts on with no trimming, has higher fin density>better air control and has been pushed to 627hp on Shivs car, so no fear of any power ceiling.

Here's a pic of the Helix next to the AMS which is similar in size to the HPF, please notice the ambient face and amount of charge rows above the mounting brackets as this is whats exposed to the ambient airflow and is what can be seen in the front of the car!

Hi Guys,
I have leased a 2011 335is and I want to upgrade the intercooler too. I guess the most important thing would be keeping the stock piping so I can reinstall the stock intercooler when the lease is over. As for trimming the shroud, I don't think it is a big deal when returning the car. To those of you who have done it, is it noticeable from outside?

I have a 2011 IS and the Wagner is what I went with for that exact reason. Totally worth it. No trimming whatsoever for Wagner FMIC install. None.